Apple Font Tools and AAT

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With ﬁnally a weekend to myself away from Atlanta and all its distractions, I have just started delving into the documentation and tutorials for the Apple Font Tools. I’m building MIF ﬁles for simple ligatures and elaborate contextual state tables, and choking on error after error. I’m losing my hair. I seem to be missing a LOCA table and have no idea how to build it.

Has anyone here used these new XML-based tools to build at least one functioning AAT font? If so, please do share your thoughts and experiences.